Petbe perey gadway



(No Model.) l

P. P. GADWAY.

ROCK DRILL. No. 304,093. Patented Aug. 26, 1884.

l A, y 24 Nrrnn Staates 1:11 riti,

wVr @ne tia PETER PERRY GADVAY, OF DETROIT, MICHIGAN, ASSIGNOR OF ONE-HALF TO FRED B. SIBLEY, OF SAME IIntC-E.V

ROCK- SPECIFICATION forming part of Letters Application tiled June 11, 1854.

.To ail whom t may concern:

Be it known that I, PETER PERRY GAD- WAY, of Detroit, in the county of Wayne and State of Michigan, have invented new and useful Improvements in Rock-Drills; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form a part ot this speciication.

This invention relates to an improvement in rock-drills of that kind intended to he worked by hand; and the invention consists in the construction and arrangement of its mechanical devices for operating the drillt 5 bar, all as more fully hereinafter' described.

In the drawings which accompany this specification, Figure I is a perspective view of my improved rock-drill, and Fig. 2 is a vertical section thereof.

A is a cuadrangular frame of suitable strength and construction to support the operating parts and give proper stability to the device.

B is the drill`-bar, secured centrally within 2 5 the frame in a vertical position by means oi' the boxes e a-one on top and one near the hottom-and which admit ot' the drill-loar heing readily removed from its position when desired, a slot, b, being provided for that pur- 3o pose in the top plate et' the frame.

C is a crown-wheel adj ustably secured upon the drill-har by a collar and setscrew, or in any other suitable manner.

D are a series of rotarylifters looselyhinged to the huh c in such manner that they may, when extended radially, be rinly held Vloy their hinges against a force trying to move them backward, but are rendered perfectly free to fall forward from such position.

IB is the shaft upon which the hub c of the lifters is secured, and F is a gear-wheel secured upon the saine shaft.

'G is a counter-shaft, upon whichfissecured the pinion H and ily-wheel I, the latter of which is provided with a crank-handle, J'.

Ii is a lever fulorumed at d, and embracing the drillbar with its forked end above the crown-wheel.

DRlLL.

Patent No. 304,0S3,vdated August 26, 1884.-.

(No model.)

into which the handle of the lever K may be 5o engaged when depressed.

M are hooks secured in pairs upon opposite sides of the frame, by means ot' which the device is made easily portable by two men using poles engaged into said hooks.

The operation of the machine is as follows: Upon turning the crank-handle a rotary inotiou is communicated to the litters, which, in quick succession, act upon the under side of the crown-wheel, which has to he placed in 6o such position upon the drill-har that the lifters will strike against its under side. Asthe litters cannot move backward after they are radially extended, a lifting motion will be given to the crownewheel, which will carry the driltbar with it; but as soon as a lifter has performed its duty of lifting it will drop forward by the action of its gravity and the superincumbent weight of the crown-wheel and drill-bar. Thus the rotation of the litters will 7o raise the drill-har, and then allow it to drop hy its gravity. At the same time the crownwheel C is raised by one of the litters it will also he rotated a little distance, owing to the engagement of one of the cogs or flanges f on its under side with the outer end of a lifter. By means ofthe lever K the drill-bar can he lifted high enough to withdraw it from the drilthole and keep the drill-har in position while a new drill is put in or the device 8o moved into a new position. The drill-har is only held in position by the two boxes a, which, when suitably constructed, admit of a ready exchange of drill hars of di'erent lengths for ditte-rent work.

Should it he found necessary to increase the lblow of the drill, an additional weightmay he secured to the drillsbar; or a coil-spring may be employed instead. To serve for ordinary use, however, the crown-wheel C is made suf- 9o iiciently heavy to answer the purpose.

In practice the machine will be found very efficient for ordinary quarry use, and with the use of four litters, as shown in the drawings,

a fall of the drill-har can be obtained nearly 95 equal to the length of the litters.

W'hat I claim as my invention is- L isastrap provided with a notch or catch,

1. In a rock-drill, the mechanism forlifting the drilhbar, consistingin the combination of l dependently from such mechanism, the lever the crown-wheel C, secured upon the drill-bnr, with in series oll rotary lifters hinged at their inner ends, so as to drop out of I@he way after lifting the crown-Wheel, substantially in the manner described.

2. ln a rock-drill machine, and ns n incans of lifting the drill, u lifter pivoted io a Inoving part of lhe driving mechanism, and constrncted and arranged to rest firmly against :i stop when lifting the drill, and to swing on its pivot and fall ont of the wny after the drill has been lifted, subsiantizrlly as described.

3. In e rock-drill, the combination of the drill-bnr secured in vertical position, and provided with an operating mechanism which is disconnected therefrom, such described, whereby the drillbzn is free io be raised in- K engaging with its inner end upon the drillbnr, in combination with aJ catch, such as the notch e in the strap L, for retaining such le Ver in .fr depressed position, substantially as and for the purpose described.

l. ln :L rocl;-clrill, the combination of the drill-bar, fr e1ownWlieel secured upon. said bar, zuid L series of lifters hinged to a shaft eonnnon to nll, but each lifter independent of lche others, substantially as and for the purpose specified.

his Ila'llill VPERRY GADXVAY.

niark.

Witnesses:

GrrilnLns J. HUNT, H. S. SPRAGUE. 

